Composite slab, block, or tile



June 19 37. R, HARRAP' 2,083,165

comPosI'TE SLAB, BLOCK, on TILE Filed Nov. 7, 19:54

ATTORNEY Patented June 8, 1937 UNITED STATES 2,os3,1s5*

coMrosrrE SLAB, BLOCK. on TILE --,Eric Russell Hal-rap, Chorlton-cum-Hardy', Man

chester,England e Application November 1, 1934, Serial No. 151,926

In Great Britain December 1, 1933 8Claims.

This invention relates to slabs of asbestoscement or like composition. The term slab is 7 used generically to include blocks, tiles and simi- According to the present invention a composite slab is made by enclosing at least one corrugated sheet made of a composition consisting of asbestos and a binding agent such as cement or'a cement substitute between two plane sheets of the same or similar material and the corrugated sheet is bonded to the plane sheets at some or all of the lines of contact. If desired the sheets may be additionally secured together by means of nails, bolts or like mechanical units, which can be readily inserted during molding and can be completely covered with additional asbestos cement and smoothed over. This serves to protect the nails or the like against corrosion and at the same time allows the slabs, blocks or tiles to be provided with completely smooth faces. Of course, the smooth faces can be interrupted by grooving or other keying if desired.

The resulting composite slab possesses very great advantages of strength in comparison with the asbestos-cement sheets or slabs that are commonly used atpresent and is much lighter than articles of equal strength made from other materials. It is in fact found'that such composite slabs will withstand very substantial impact stresses and at the same time are so light that they can advantageously be used not only for the manufacture of roofs or floors but also of walls.

The strength of the finished slab may be increased by increasing thedepth of the corrugations or the thickness of the material or both.

oslabs show- Figure 3 is a. perspective view illustrating fou; composite slabs in a row, the joints between which are of different natures, forthe purpose of illustration.

Figures 4, 5 and 6 are detailed sectional views, of which Figure 4 is an ordinary butt joint, Figure 5 is the joint between two slabs having in- PATENT orrlcg' j clind edges running away from one another,

and Figure (iillustrates a mitred joint.

In the form of slab shown in Figure 1 a corrugated sheet 1 of asbestos-cement is secured between two rectangular plane sheets 2 and 3 of.

' the same material, the lines of contact between the corrugated sheet and the plane sheet being equidistant from each other and parallel-to the long edge of the rectangular sheets. In the usual form of construction the corrugated sheet is se- 1 by the lines 4 by means of cement, asbestoscement or similar binding compositions.

The fact is that a very little of the bonding agent is put in and the resultant joint is practically invisible, i. e., the bonding does make the sheets integral with one another.

cured to the'plane sheets along the longitudinal tangent lines of the corrugations indicated in Fig.-

When it is desired to join together two or more such slabs they are placed either end to end with the compartments 5 of each slab registering with each other or else they may be placed with their longer edges in contact. In the latter case the open end compartment 6 of each slab will form each half of a closed compartment in the combined slab. In either case the union is effected by filling adjaoent'compartments of the two slabs with cement, although when the two slabs are being joined along their shorter edges it is not necessary to fill all the registering compartments with cement. p 4

Figure 2- shows a particularly convenient form of slab which can be joined to a similar slab by means of a mitred joint. 0n joining up the two slabs shown and filling up some or all of the registering compartments 5 with cement, a flrni union may be effected between the two slabs.

The slabs are equally adapted to be joined to a wall or other fixed object and for this purpose the slab is placed in the desired position and may be attacheclto the wall by placing cement in one or more of the compartments enclosed between the wall and the sheets I, 2 and 3. I

In Figures 4, 5 and 6 the reinforcing rods may be of any desired length, andif desired may extend completely across the slab.

If it is desired to reinforce a structure made from a number of such composite slabs. it.is a

simple matter to pass iron or like stay bars or tubes down the registering longitudinal spaces within the composite slabs or the like or these reinforcing bars or tubes may be inserted during manufacture as described above.

I claim:-

1. As a new article of manufacture, a slab comprising two plane sheets composed of asbestos and a binding agent enclosing a corrugated sheet of the same or similar composition, the corrugated sheet being bonded to the plane sheets at a number of their lines of contact by means of said composition to give an integral whole. a

2. As a new article of manufacture, a slab comprising two plane sheets composed of asbestos and a binding agent enclosing a corrugated sheet of the same or similar composition, said corrugated sheet being bonded to said plane sheets by means of a binding agent.

3. As a new article of manufacture, a slab comprising two plane sheets composed of asbestoscement enclosing a corrugated sheet of the same or similar composition, said corrugated sheet being bonded to. said plane sheets by means of a binding agent.

4. As a new article of manufacture, a slab 'comprising two plane sheets composed ofasbestoscement or like composition enclosing a corrugated sheet of a similar composition, said corrugated sheet being secured to said plane sheets by means of mechanical units together with a quantity of cement binding agent, said binding agent comthereto, together with rigid bars fixed in the spaces enclosed between said corrugated sheet and each of said plane sheets.

6. In building, the steps which comprise aligning in contact a plurality of composite slabs each composed of a corrugated sheet of asbestos-cement or like composition enclosed within two plane-sheets of the same or similar composition and each having edges making an oblique angle with the plane sheets bounding them, and uniting said slabs by means of a binding agent inserted into the spaces left between contacting edges,

' whereby to form an integral structure having mitred joints.

7. As a new article of manufacture, a slab comprising two plane sheets composed of asbestos and a binding agent enclosing a corrugated sheet of the same or similar construction, said corrugated sheet being bonded to said plane sheets by means of a binding agent of the same material.

8. As a new article of manufacture, a slab comprising two plane sheets composed of asbestoscement enclosing a corrugated sheet of the same or similar composition, said corrugated sheet being bonded to said plane sheets by means of a cement binding agent.

- ERIC RUSSELL HARRAP.

l x "33. I 

